How to create a zip file and download in Java using Strut2?

Question

I have a web application developed using Struts2. In my web application I have a link using which users can download a zip file. I need to create this zip file at run time based on some conditions. How can I do this in Struts2?

Answer 1

Use zipOutputStream to create zip file like following

ZipEntry entry = new ZipEntry( fileName ); // You have to give each entry a different filename
zipOutputStream.putNextEntry( entry );
byte buffer[] = new byte[ 1024 ]; // 1024 is the buffer size here, but it could be anything really
int count;
while( (count = inputStream.read( buffer, 0, 1024 ) ) != -1 ) {
    zipOutputStream.write( buffer, 0, count );
}

And then send the output to your struts.xml file for download...